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  1. B200 工学部/工学研究科
  2. B200a 雑誌掲載論文
  3. 学術雑誌

Pressure and spanwise velocity fluctuations in turbulent channel flows: Logarithmic behavior of moments and coherent structures

http://hdl.handle.net/2237/00030536
http://hdl.handle.net/2237/00030536
45b5aa0d-2e41-434c-b3fa-3400bce9e3f4
名前 / ファイル ライセンス アクション
PhysRevFluids_4_044601.pdf PhysRevFluids_4_044601 (5.0 MB)
Item type 学術雑誌論文 / Journal Article(1)
公開日 2019-07-10
タイトル
タイトル Pressure and spanwise velocity fluctuations in turbulent channel flows: Logarithmic behavior of moments and coherent structures
言語 en
著者 Mehrez, Ali

× Mehrez, Ali

WEKO 92555

en Mehrez, Ali

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Philip, Jimmy

× Philip, Jimmy

WEKO 92556

en Philip, Jimmy

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Yamamoto, Yoshinobu

× Yamamoto, Yoshinobu

WEKO 92557

en Yamamoto, Yoshinobu

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Tsuji, Yoshiyuki

× Tsuji, Yoshiyuki

WEKO 92558

en Tsuji, Yoshiyuki

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アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
権利
言語 en
権利情報 © 2019 American Physical Society
抄録
内容記述 We study the logarithmic behavior of the pressure variance<p^+2> from the datasets obtained from direct numerical simulations of turbulent channel flow for friction Reynolds number Reτ up to 4000. The higher-order moments of p were found to follow logarithmic behaviors at the same distances from the wall where <p^+2> shows its log profile. The same results have been confirmed for the spanwise velocity fluctuations w at the same Reynolds numbers, with both p and w following a super-Gaussian behavior. The minimum Reynolds number for <p^+2> and <w^+2> log profiles to appear is Reτ ≈ 500, where flow structures O(h) or less were found to significantly contribute to these profiles. The configuration of the hairpin eddy structures obtained from the conditional sampling at different wall-normal locations showed a strong link between p and w fluctuations. Positive pressure fluctuations are located between the legs of the hairpin eddy, while the negative pressure fluctuations are consistent with the head part of the hairpin eddy. Positive and negative spanwise velocity fluctuations are strongly positioned with the legs of the hairpin eddy, consistent with the counter-rotating motion resulting from the eddy legs. The structures were also found to be geometrically self-similar such that their length and their width increase linearly with the distance from the wall.
言語 en
内容記述タイプ Abstract
出版者
言語 en
出版者 American Physical Society
言語
言語 eng
資源タイプ
資源タイプresource http://purl.org/coar/resource_type/c_6501
タイプ journal article
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
DOI
関連タイプ isVersionOf
識別子タイプ DOI
関連識別子 https://doi.org/10.1103/PhysRevFluids.4.044601
ISSN(Online)
収録物識別子タイプ EISSN
収録物識別子 2469-990X
書誌情報 en : Physical Review Fluids

巻 4, 号 4, p. 044601, 発行日 2019-04
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